Safety steam



(No Model.). I 3 Sheets-Sheet 1.

- 0. A. HATCH. v APPARATUS FOR STOPPING ENGINES. No. 506,229. Patented Oct. 10,1893.

(No M01181.) I H3 Sheets-Sheet 2. CPA. HATCH.

APPARATUS FOR-STOPPING ENGINES. No. 506,229. Patented 001;. 10,1893.

lllll II (No Model.)

APPARATUS FOR STOPPING ENGINES.

No.- 506,229. Patented 0ct'.'10, 1893.

CHARLES A. HATCH, on HARTFORD;CONNECTICUT, nss 'cnon TO THE I SAFETY STEAM APPLIANCE COMPANY, OF BOSTON, MASSACHUSETTS.

.A'P As ATus FOR sToPP NeENeiwns. I

SPECIFICATION forming part of Letters Iatent No. 506,229, dated Qctober 10, 1893.

Application an; February 27.1593. Serial No. 463.991. (No model.)

To all whom it may concern.- Be .it known-that I, CHARLES A. HATCH, of Hartford, in the c'ountyof Hartford and State ofConnecticut, have invented certain new and useful Improvemen-ts'in Apparatus for Stopping Engines,- of which the following is a full, clear, and exact descrip'tiom-wheieby any one skilled-in. the art can make and use the same.

The object of my invention is to provide an,

- apparatus by means of whicha steam engine maybe stopped either at a distance from the engine or by the movement of a part of the engine; and to thisend my invention consists, in the details of the several parts making up the apparatus as a whole and inthecombination of such parts asare moreparticularly hereinafter described and pointed out in the claimsl r Referring'to the drawings: Flgurel' is a plan viewof myapparatuswith parts broken away to show constructiom Fig.'.2 is a detail 'view in side jelevationof part of the mechan ism on a plane cutting vertically through the base between the main shaft'and the plunger chamber.- Fig. 3'isa detail view in vertical 7 section through that part of the machine shown in Fig. 23nd looking to the right. Fig. e is a detail view in cross section of the main shaft. Fig. 5 is adeta'il plan view showing ,parts of the clutch mechanism. Fig. 6is' a';

detail view in elevation-."showing part of the catch mechanism. Fig. Us a detail diagram view illustrating the manner of use of my im- 5 proved device when connected withthe governor of the engine. Fig. 8 is a detail view I showing "a form of fastening means for the pull rodattached to the pawl operating. device.

In the accompanying drawings the letter a.-

' denotesabase on which in bearings b is supported a shaft 0 having on its outer end a sprocket wheel'd and, preferably at the other -end,a spring barrel e, in case where a spring serves as the motive power for driving the shaft. One end of the springi's secured in the usual manner to the outer wall of the spring barrel while the other end is secured to a short shaft a that projects into the spring barrel from the bracket b within which it is secured --against rotary. movement.- The shaft 0 for a "portion of its length is screw threaded as shown and on this shaft islocated a portion of thepawl actuating mechanism consisting of an adjustable nut f and a collar g. Around the periphery of the nut j' there are provided at certain intervals notches f witliin'which is located a guide h. The guide it is preferably secured to the top of andextends between the bearings b, thumb screws It being preferably used for securing itin place so that it may be easily and quickly removed and replaced in position; The object of-this construction is that the adjustable nut f may be located in the proper position on the shaft 0 and then by putting-theguide 72. in place so that it is inserted in one of the grooves in the nut, by the operation of the'device the not will be moved alongthe shaft the required-distance :to properly engage and operate the several collar g is held-against rotation upon the shaft 0 but is free to move lengthwise thereand upon this collar g is pivoted a bent lever 9', one end 9 of'which is provided with a cam surface {1 adapted to engage the collar f,and the other end g extending around the collar g and engaging a collar '11 secured to the pawl '11. .To the portion 9 of the bent'lever g is pivoted one end of a rod "9 that extends outward through the side of a case located upon the base, as shown-in Fig. 8 of the drawings. 'The outer end of this rod is provided with a suitable handlexg for use in operating the trip device by hand. ,The under side of this jects a spring actuated slide j that is secured ,to the side of the casing by means of a pin the latter being square and engaging a slot in the slide j by means of which the latter is "held against rotation but is free to move lengthwise upon the pin j A spring j? se cured to theside of the casing projects into the path of the slide j"and tends normally to hold it in an upward position to engage the recess j in the rod g and to the lower end of the slide j issecured a pin 7' pro iecting through the casing to the outside and proby means of which the slide may be caused to move out of engagement with the recess j on the rod 9. By this arrangement when the 'deviceswith which it comes in contact. The- 'on the shaft rotating freely within the collar,'

vided onits outer end with a proper handle I rod ispro'videdwith a'recess j into which probe thrown inward. I In the upper part and on one side of the bearings b is borne the pawl 73 the inner end .of which is beveled-on one side and the outer end being provided with a pin 71 to limit the lengthwise movement of the pawl. The hearing 1) next to the spring barrel e is provided with a recess 2' (see Fig. 5), within'which is located a spiral spring i on the pawl 2, one

end of the spring projecting against the inner end of the socket and the other against the collar 2'. There is located on the pawl 21 between the collar 7," and the collar 2' another spiral spring 11 larger than the spring 71 one end of the former bearing against the collar 'i' and the other against the collarv 2' The collar 1' is loosely mounted on the pawl 71 the latter of which has a lengthwise movement therein, and to this collar 2' is pivoted one end of the trip lever d that is also pivoted at its center to a. fixed part projecting from the base and with its lower end engaging a lug located on the armature of an electro magnet.

Pivoted on the posts is and extending across the base to the outside of the casing'is a rod is and on this rod 70 is secured a contact k that rests in one position against. the top of one of the posts is and also against the nut 11 so that as the latter is moved upon the release of the trip lever 2' from engagement with the-lug of the armature of the electro magnet and under the impulse of the spring '6 it is thrown down into engagement with the binding post kfithusclosingan electric circuit and causing an alarm to be rung until the contact is turned up out of engagement with the post 10 after been stopped, and the not 2' has been returned to its normal position, that is, so that the trip lever 2' engages the lug on the armapulse of the spring i.

ture of the electro magnet. An electro magnetl is located on the base a immediately under the parts abo e described and in such position that by the pressure of a push button placed in any desired location the electric circuit will be (in this instance) closed, thus causing the armature I having one end pivoted on the post Z to be drawn up against the coils of the magnet disengaging the lug Z from the trip lever 1' and causing the collar d to be forced backward under the im- A spring 1 is attached to one end of the armature Z tending normally to hold it in an outward position and an adjustment of the outward position of this armature may be gained by use of the adjusting screw Z proje ,tiug through a screw threaded opening in the post Z, as shown in Fig. 7 of the drawings.

In bearings 0 secured preferably to the base of the machine is mounted a brakeshatt m on which is secnreda earmin mesh with b the gear e on the spring barrel 6; there is the engine has alsofsecured to'this brakeqshafta ratchet I the base supported on a suitablestandard and in line with the brake shaftmacyl-inder 0, one end of which is formed preferably of ascrew cap 0' fitting upon the threaded end of the cylinder; A threaded flange o projects from" the cap 0 upoii which is fitted a screw threaded nut o between the outer end of which and the end of the flange 0 maybe located'a packing o for packing the joint in theusual manner.

Projecting through the opening 0 in the end of the cylinder and also in the nut 0 is a piston rod 0 having an opening 0 ,-the walls of which are screw threaded'to fit the screw threaded end of the shaft m The piston rod 0 bears the piston 0 within one side of which is located the opening 0 closed by the valve 0 that opens toward theleft hand side of the piston. There is also provided in the piston an angular-opening 0 that is adapted to be closed by the regulator consisting of a rod 0 projecting through the piston rod and into the opening 0 the outer end of this rod being screw threaded to fita screw thread in the piston and provided with any suitable means, in this instance a squared end, by

means of which the rod may be turned to open .or close the opening 0 through the piston.

WVithin the cylinder is placed any suitable fluid, preferably glycerine, this being more especially adapted to preserve its normal condition through the different changes of the temperature. A guide pin 0 is secured in the bearing 1) and projects into an opening 0 within the piston rod, thus guiding thelatter in its lengthwise movement and holding the same against rotation. The piston rod extends from the piston through the opposite end of the cylinder in order to fill the space occupied by the glycerinejn its movement from that side of the piston to the opposite side and thus obviate the creation of a vacuum within the cylinder.

In operation when the device as a whole is set the piston will'be at the left hand limit of its play and when the device begins to operate under the tension of the spring in the spring barrel 6 the escape of the fluid from the right to the left hand side of the piston through the opening 0 allows said piston to move to the right at a speed limited by the size of the opening 0 through which the glycerine moves from one side of the piston to the other, governed by the regulator 0 In the opposite movement of the piston the fluid within-the cylinder may move freely from the right hand to the left hand side of the piston through the opening above mentioned and in addition thereto through the opening 0 this opening being closed by the valve 0 in the opposite movement of the piston.

A governor p of ordinary construction that is usually located on an engine or like motor in connection with which this device is used to a's-the engine attains a greater speed the balls of the governor are thrown outward b'y' centrifugal force until thedownward movement of the rod p causes the adj ustahle shoulder 12 located thereon to closethe'contact's 1 a thereby closing the circuit and 'drawing the armature 1' against thei coils,=thus releasing the trip 2' and operating to stop the engine. A'ohain q extends aroundthe sprocket d and i around a sprocket q fast to the throttle 'r' so '20 that by the movement of the latte'rthe device may beset in'position to-operate upon the 7 release of thetrip v7.

The operation 9f the device is as follows:

' The trip if having been engaged with the lug 2 5 1 on the armature Z the turning of the hand wheellooated on the throttle valve through the mediumof the sprocketlwheels'q' and d j and the chain q'operates'to turnthe-main shaf-tc of the device causing the adjustable o nut fto move to the-left as shown in Fig. 1 of 'the drawings.- This will cause -the-cam surface 9 located on the. end 9 of the. arm

'g to slide along the nut f underqthe im pulse of the larger spring i acting against 3 5 the springrl thus throwing the pawl gradua ally into engagement with the ratchet on 'the wheel n until the nut f has been disen- 4 'gaged from such surface-when thepawl is r then in full operation in. connection with the 6 said ratchet wheel. The hand wheel on-the throttle is turned until the throttle has been opened to the desired distance when thede- ,vice is set and in readiness to operate to shut down the engine. Closing the electric cir- I cuit as by the pressing of a button placed in .any desired locality or by the action of the governor as before described causes the armature Z to'be-d'rawn against the coils thus releasing the trip lever a from engagement '50 with. the lug Z -on the armature and throwing the collar i quickly to the left upon the pawl t' andunder the impulseof'the spring 1. The

movement of this'collart' causes the contactk to be thrown-downin'engagement with the post It", thus closing the circuit and cansing, a bell located in' anydesired'positionto be rung untilthe contact is moved out oftengagem'entwiththe; post.k-*.'- The release of the trip lever-t7 and the-consequent move-u 6ov ment of the collar 71 to theleft releases the tension on the spring rl,'thus causing thet'ension of the springfrl to force the pawl 2 out of'engagement with the ratchet'teeth on the --wheel.n. This allows the spring located in the spring barrel e tooperatejto revolve said spring barreland consequently the main shaft 0 and 0 causes the nut f to be moved to the rightuntil it comes in engagement with the nut i located on the pawl' l moving the former to -the right an'djcausing the trip lever 1J to'be again engaged with thelug Z on the armature Z. The. movement of this'collar i to the I right has also placed a tension on the spring 12' and caused thebent lever'g to come in con;-

parts. v

: t The apparatus is adapted to be operated by means of a push button or likedevice, or as f many of them as may be desired, located in any partor'parts of the factory within which is located the machinery'desired to be driven by 1211611101201,- the circuit preferably remailr 'ingopen and beingclosed by the pushing of the motor. The closing of the circuit causes the armature to be drawn towardthe magnet and by this movement of the armature the catch is released. I

I claim as my invention 1. In an apparatus for stopping an engine or other motor, inoombinati'on, a spring actuated shaft having a threaded portion, an actuating spring withone end securedto the shaft wheel on the br'ake'shaft, a pawl adapted to engage the teeth of the ratchet wheel located on the brake shaft, the pawl tripping mechanism substantially as described, and a fluid brake comprising a cylinder filled with liquid and a reciprocating piston fitting the threaded described, 1

,2. In an apparatus for stopping a'n'engine ated shaft having a threaded portion, a gear wheel secured to the shaft, the shaft actuating spring, abrake shaft having a gear wheel in mesh with the gear wheel onthe main shaft,

.pawl adapted to; engage'the teeth on the ratchet wheel, the pawltripping mechanism ciprocating piston fitting the threaded end of the brake shaft, and a regulating device for substantially as described.

. a 3. In an apparatus for stopping a steam en gine orother motor, a springactuated shaft,

a ratchet located in operative relation to said tripping mechanism substantially as described, and a brake device consisting of a cylinder tilled withfliquid,a pistonmovable within said cylinder, a piston rodattached to the piston andhaving oneend screw threaded and engaging a screw threaded member in operative engagemen't with themain shaft,

through the sprockets. d and q and all substantially as described chain q operates to shut oif the steam by closj ing the throttle 'r. The revolution of the shaft 7 e substantially as described, a fluid brake comprising acylinderfilled with liquid and a re- 'tact withthe collar f,the position occupied. 1 by the device in the normal position of the the button or by a movement of some part of and the other to a fixed part of the franie, a gearwheel fixed to the. shaftand engaging a I CC - or other motor, in combination,a spring actua ratchet wheelglocated on the brake shaft, a v

controlling the movement of the piston, all

shaft, a pawl engaging said ratchet, thepawl 1C5 endilof thebrake shaft, all substantially as I Y in operative relation to said shaft whereby the rotation of the latter is governed, a spring actuated pawl adapted to engage the ratchet,

4. In combination in a device for stopping on the main shaft and provided with meansfor holding the pawl automatically out of engagement with the ratchet, and the trip oper ating device, all substantially as described.

, 5. In combination in an apparatus for stopping an engine, a spring actuatedshaft having a threaded portion, a ratchet supported a'nut borne on the threaded portion of the shaft, the'mechanism substantially as described for controlling the movement of the the collar loosely mounted on the pawl in the pawl, and the trip device, all substantially as described. 6. In combination in a device for stopping an engine, a spring actuated'shaft having a threaded portion, a ratchet borne in operative relation to said shaftwhereby the shaft is held against rotation, a spring actuated pawl adapted to engage the ratchet, a nut borne on the-threaded portionof the shaft and adapted to engage the pawl controlling mechanism, the pawl controlling mechanism substantially as described, the collar loosely mounted-on the pawl'in the path of'm'ovement of-the nut on themain shaft, and the trip lever pivoted to the collar at one end and with its other end engaging atrip device. all substantially as described.

7 .In combination in an apparatus for stopping an engine, a spring actuated shaft,-a

ratchet supported in operative relation to said shaft whereby the latter is held against rotary movement, a pawl adapted to engage the ratchet,a spring located on the inner end of the pawl and bearing against a collar integral'therewith,the collar located on the'end of the pawl controlling mechanism and secured to the pawl, the spring located between this collar and the collar loosely mounted on the pawl, the collar loosely mounted on the pawl, the trip lever pivoted at its center with one end pivoted to'the collar loosely mounted on the pawl and the other end in engagement with the trip. device, all substantially as described.

' 8. Incombination in a device'ifor stopping an engine, a sprin'gactuated shaft having a threaded portion, a ratchet supported in operative relation to said shaft whereby thelatter is held against rotary movement, a spring actuated pawl adapted to engage the ratchet, a nut borne on the threaded portion of/ the main shaft and held against rotation thereon,

path of movemen-tof the collar on. the main shaft, the tripflever'h'aving a central pivot with, one endjpivoted to the collar on the pawl and the other in engagement with the trip device, all substantially as described.

9. In combination inadevice for stopping an engine,a spring actuated'shaft having a threaded portion, aratchet supported in operative relation to said shaft whereby the latter is held against rotation, a spring actuatedpawl adapted to engagethe ratchet, the tripping mechanism substantially as described having a part joined up within an electric cir cuit, an alarmalso connected up within said circuit and adapted to be rung upon the'operation of the trip device, and thelever'supporting the contactwhereby the sounding of the alarm is controlled, all sup gtantially as described.

10. In combination in a device for stopping an engine, a spring actuated shaft ,havinga threaded portion, a ratchetsupported in operative connection with said shaft whe eby the latter is held against rotarymovement, a pawl engaging the ratchet, the pawl tripping mechanism substantially as described, the nut located on the main shaft and adapted to reset the tripping mechanism, the bent lever supported on a collar loosely mounted on the main shaft with one end integral with the pawl and the other end having a cam surface" located in the path of movement of the nut on the main shaft, all substantially as described.

11; In combination in a device for stopping an engine, a spring actuated shaft, a ratchet the pawl adapted to engage the ratchet, the

supported in operative relation to said shaft whereby the latter is held against rotation,

pawl tripping device substantially as described, the nut located on the main shaft adapted to reset the pawl tripping device, the

pawl controlling mechanism supported on the main shaft toengage with the said nut, the

lever extending to the outside of the case whereby the pawl controlling mechanism may be operated ,by hand, all substantially as described;

12, In combination in a device for stopping an engine, a spring actuated shaft having a threaded portion, a ratchet supported in operative relation to said shaft, the pawl adapted to engage the ratchet, the tripping device substantially as described, the .pawl control-v ling device located on the main shaft, the nut supported on the threaded portion of the shaft adapted toengage the pawl tripping and the pawl controlling devices, the lever projecting from the pawl controlling device to the outside of the box whereby the former may be 1 operated by hand, and the springcatch adapted to engage the said lever, all substantially as described.

13. In combination in a device for stopping an engine, a spring actuated shaft having a threaded portion, a ratchet supported in op erative relation to said shaft whereby the'laiter is held against rotation, thepawl engag ing the ratchet, the pawl controlling mechan' ism substantially as described located on the main shaft, the nut located on the threaded portion of the main shaft and adaptedto engage the pawlcontrol'ling and pawl tripping devices, the pawl trip device in engagement with the armature of an electro magnet, the armature ofan electr'o magnet adapted to be moved by the opening or closing of the circuit to release thefpawl tripping device, all

threaded portionfof the main shaft adapted to engage the pawl controlling and pawl tripping devices, the brake shaft having a threaded portion and located in operative'relation to-the main shaft, the nut supported, onthe threadedportion ofthe main shaft adapted to engage the pawl tripping device, and the brake consisting of a cylinder containing-a piston and piston rod with a threaded portion adapted to engage the threaded portion-of the brake shaft, all substantially as described.

15. In combination with-the spring actuated shaft and pawl perating mechanism of a device for stoppi g an engine, a brake shaft having a threaded portion mounted in operative relation \to the spring actuated shaft and bearing a ratchet wheel i engagement with the pawl of the pawl oper ting mechanism, a cylinder supported on a standard, a piston rod located within'the cylinder, bearing a piston and having a t readed portion engaging the threaded port it of the brake shaftand the relief ports 1 cated in-the piston, all substantially as described.

16. In combination with the spring actuated shaft and pawl operating mechanism of a device for stopping an engine, a brake shaft havlng a threaded portion and supported in operative relation to the main shaft andbearing a ratchet wheel adapted to engage the pawl of the pawl-operatin g mechanism, a cyl inder adapted to be filled with a liquid and bearing a piston rod having a threaded portion in engagement with the threaded portion of the brake shaft, the relief port located in the piston and, provided with an automatic v5 valve,'and the port having a valve controlling the movement of thepiston, all substantially as described.

17. In'combination with thesprin g actuated shaft and pawl operating mechanism of adevi ce for stopping an engine, a brake shaft having a'threaded portion and supported in operative relation to the spring actuated shaft and bearing a ratchet wheel adapted to engage the pawl of the pawl operating mechanism, a cylinder adapted to befilled with aliquid as glycerine, a'piston located within said cylinder bearing a relief port open'i n one movement of the piston and closed in the op-' posite movement, the port located inthe piston, the piston rod supporting the piston and held-againstrotation within the cylinder, and

the valve projecting through the piston rod into the port whereby the movement of the 'piston maybe controlled, all substantially-as described. a

18;. In combination in an apparatus for stopping 'an engine,a spring actuated shaft having a threaded portion, a ratchet supported in operative relation to said shaft whereby the rotation of the latter isgoverned, a spring actuated pawl adapted to engage the ratchet, a nut borne on the threaded portion of the shaft, the mechanism substantially as described for. controlling the movement of the pawl,and the trip device adapted to be operated by an electric circuit controlled bythe operation of the governor of the engine, all

substantially as described.

19. In combination in a device for stopping an engine, a spring actuated. shaft, a brake device substantially as described located in operative relation tosaid shaft, a ratchet, a

springactuated pawl j adaptedto engage the ratchet, the pawl operating device mounted on themain shaft and provided with means for holding the pawl automatically out of engagement with the ratchet, and the trip device adapted to be operated by an electric circuit controlled by the operation of the governor of the engine, all substantially as described.- I p 20. In combination in adevice for stopping an engine, a spring actuated shaft having a threaded portion,a ratchet supported in op- .erative relation to said shaft, the spring a'ctuated pawl engaging the ratchet, the collar loosely mounted'on the pawl, the trip lever supported on thebase with one end pivoted to the collar. on thepawl and the other end in engagement with the trip-releasing mechanism, and the nut locatedon the threaded portion of theg'main shaft whereby the trip device is reset by the rotation'of the main shaft,

all substantially asdescribed.v

CHARLES A. HATCH.

Witnesses: I

ARTHUR B. JENKINS, JULIA STERN. 

